Adjustable connecting bridge for goggle frames



Od.` 9, 1945. F|5HER 2,386,17 5

1 ADJUSTABLE CONNECTING BRIDGE FOR QQGGLE FRAMES Filed Jan. 8, 1942 2 Sheets-Sheet l `ADJUSTABLE coNNEQTING BRIDGE 'FOR GoGGpE FRAMES Filed Jn. 8, V-1942 2 Sheets-Sheet 2 IN ENTR Charles vlfscher Patented Oct. 9, 1945 OFFICE ADJUSTABLE ooNNEo'rING BRIDGE. FOR

GoGGLE FRAMES Charles Fischer, New York, N. Y.

the bridge.

The inventioncontemplates the provision of bridge adjusting means comprising few parts easily and` economically made and assembled and easily locked to maintain the adjustment, and requiring little skill 4and no tools for its operation.

,The invention further contemplates the provision ,of bridge adjusting means 'giving Ya wide range of adjustment by acomparatively slight amount of rotation in the proper direction of the control member thereof, said member causing overlapping of the bridge parts to decrease the4 sizeof thebridge, or separating the bridge parts to increase the size -of the bridge, thereby adjusting the eyeV frames of the goggles in whichthe ,l bridge is used to the dierent spacing between the eyes of different users. u The invention further contemplates the provi- While simple, inexpensive and efcient, maybe operated manually and easily by an axial unlocking I diametrically opposite points of a rotatable operating member, .whereby rotation of said member adjusts the effective size of the bridge.

The various objects of the invention will` be I clear, from the description which follows and from the drawings, in which, l

. Fig. l is a front elevational view, partly broken away, of one form of my improved adjusting Application January 8,'1942, Serial No. 425,950 17 olaiins.

`nection to the control member replaces the rack and pinion connection. 1

Fig. 8 is a horizontal section of the same.

Fig. 9 is a fragmentary view of one of the sliding bridge parts of Figs. 'I and 8, showing the'slots therein. l

Fig. 10 isa similar view of the other cooperating bridge part. I I .I f I Fig.V 11 is a top plan view of the operating pincarrying disc.

Fig. 12 is a front View `similar to Fig. 7 of another form Aof the adjusting means showing the automatic locking means of Figs. 5 and 6 applied to the slot and pin operating means.

Fig.` 13- is a vertical section of the'same taken 'In the practical embodiment of the invention shown by wayfof example, and referring' particu- 4the respective hinge pins IIJ and Il.

sion of, normally locked adjusting means, which, o

larly to Figs. 1 to 4,`the bridge preferably, though not necessarily, is h'inge'dly mounted at its ends on The bridge connects the eye frames I2 and I3 in the usual manner, each of said frames having the usual glass or lens inserted thereinto. The frame I2 carries the hinge part I4 having a terminal loop receiving Ythe hinge pin I0, while the frame I3 carries the' similar hinge part I5 provided with a suitable corresponding loop receiving the pin Il. The bridge comprises the relatively slidable parts I6 and I1, preferably L-shaped, and slidably mounted within the casing I8 for adjustingmovemeans `as it appears applied to an aviators Y goggles.

Fig. 2 is a horizontal section of the same taken onfthe line 2 2 of Fig. 1.

Fig. 3 is a vertical section of the same taken on f the une 3-3 of Fig. 2.

Fig. 4 is a rear view of the control member and of the operated pinion support member associated therewith. Y Fig.v 5 is a partial top plan view and horzontalfarev overlapped laterally and apin and slot con-"-55 "m'ent in opposite directions. Said casing is preferably made in the form of a flattened metal tube u of rectangular crosssection having open ends 351 through which pass the respective bridge parts I6 and I'I. The front wall I9 of the casing is provided with aseries oflocking apertures as 20 sufficient in number and properly spaced circumferentially to afford the desired selection of the selectively to determine the elective overall length of the bridge and the required spacing between the eye frames I 2 and I3. Preferably,cen trally of the casing wall `IJ is provided the opening 2 I throughwhich passes the pinion hub or support 22 'which, in the form being described, is preferably square or polygonal in cross-section.

'The diameterof said opening 2| is substantially the same as the largest cross-sectional dimension of the support 22, that is, substantially'equal to the diagonal distance between the corner edges of the support,` so that the wall of the openingZI forms a bearing and guide for said support as said l support is rotated,` without Vpermitting any other Vverse edge "44 of the Vslidable part l1.

substantial movement of the support in any direction except rotation.

Said support is internally threaded at its inner end as 23 to receive the externally threaded shaft 24 projecting from the pinion 25, thereby to form a hub for the pinion rotatable therewith as a unit. At its outer end, the support 22 is also internally threaded as at 26 to receive the externally threaded shankof the screw 21 which is provided vwith an enlarged head. Between -said head and the end wall or base 28 of the manually operable hollow control member 29, is arranged the spring 3), said spring urging the member 29 inwardly against the outer face of the wall`|9 and toward the apertures 20. The projection 3| extending inwardly from the inner face of the base 28 is thereby urged into that one of the openings 20 with which it may register.

In the base 28 of the member 29 is formed the substantially square or polygonal opening 45 of the same shape and size as the cross-section of the supportl 22, into which opening said support member is tted and passesloosely, whereby rotation of the member 29 .in eitherdirection causesy rotation of the support member 22 and consequent rotation of the pinion 25 as .a unit. When the projection 3|.is in a selected one of the openings 2U, the parts, including'the pinion 25, the hub or support 22, and .the control member 29 are locked together against accidentalA wall of'the casingv and is guided thereby in its movement, the parts yI6 and Y|1 being vheld 4in .place and also guided by the rear wallof the casing. Similarly, the leg |6a on the L-shaped slidable part I is provided with the rack 35 meshing with the diametrically opposite teeth of the vpinion 25, and its lowermost edge 36 engages the inner surface of the bottom wall of the casing? I8. The bridge part i1 terminates in a'pair of spacedv loops 31, 38 pivotally mounted on the hinge pin while the part I6 similarly terminatos in the spaced loops 39 and 40 pivot-ally mounted on the hinge pin l0, whereby the bridge is pivotally connected to the eye frames.

In the collapsed or contracted positions of the parts` I5 and '|1, Ythat is, in that position of `said parts yeffective to make the bridge of its minimum overall length, the .free-end edge 4| of the leg 41aA is 'arranged -clo'se to or in contact with upright transverse edge 42 of 'the slidable part |'6. vIn sai'd position, the end edge 43 of the rack 35 is similarly adjacent to 'or in contact with the trans- The legs I'Sa and Ha thereby are arranged in transverse `roverlapping relation. In the extended ,positions of said parts, however, wherein the effective -or overall length of the bridge is increased, the edges 4|and 42 .are yseparated and tide edges 43 and 44 are' similarlyV separated."

'To accomplish the adjustment 'of the bridge, the control member l2i) Vis rst pulled axially and in t'he )proper direction to remove the projection V3| .from that opening 20 in which :it is .loca-ted,y

thereby unlocking the :bridge parts ready for further adjust-m-ent, that is, for shortening or flengthening the bridge. To .increase the 'eiv-ective length of the :brid-ge, the; member-.'29 vkafter being unlocked, yis rotated vin aolockwise direction Las' viewed in Fig. 1, thereby rotating the support 22 within the opening 2| and also rotating the pinion 25. Such rotation of the pinion causes the rack 32 and the slide part |1 to move toward the right, and simultaneously causes the rack 35 and its slide I6 to move toward the left, thus separating the frames I2 and i3. When the desired distance between the frames has been attained, the member 29 is released, whereupon the spring 30 urges 'said member inwardly to insert the projection "3|` into that one of the openings 20 with which it is in registration. If it does not enter the selected opening, the member 29, after its release, maybe turned additionally through a small angle to carry the projection into registration with the nearest opening 20, whereupon the spring 30 becomes effective to lock the parts against any further 'movement. .To shorten the bridge, the above described operation is carried out in the same manner, .excepting thatthe control member -29 is rotated Vin a counterclockwise direction.

.In that form of the invention shown in Figs. 5 and 6, the pinion 49, which is similarA to the pinion 25 and similarly arranged, is provided with 4an internally threaded hub 50 receiving the externally threaded shank 5| of kthe pinion Support or voperating member 52. Said member is provided with an enlarged head formed with a pair of diametrically opposed outwardly extending lugs orwings 53 and 54 entering respectively the corresponding co-axiallyrdisposed slots 55 and 56 of the control member 51. The spring 58, similar to the spring 39, is interposed between the head of the `member-52 and the base or end wall of the control member 51 and urges the control member inwardlyvto cause the projection 3| thereof`to enter the selected opening 20, it being understood thatl .thecontrol member is slidable on the member 52. The'operation of v this form of my invention is similar to that previously described, the Vcontrol member 51 being irst pulledfaxially away from the casing along the member152 to remove the. projection 3| .from its -locking opening Vand then rotated in the proper direction to cause `thepinion to operate the racks 32 and 35'and thereby to adjust the overall length of the bridge in the manner. already mentioned. The member 51 slides `freely Ain an axial direction on the Ymember 52, theopening in the base thereof loosely iitting the member .52 and serving asa bearing therefor. The Wings .53, .54,

however, andtheslots 55, 56 insure .rotation of the members 51, 52 and the pinion 49 as a unit.

It will be noted that in both forms of the invention, the control member, the pinion, and the parts operatively connecting the control member to thev pinion, as well as the casing, remain at all times at -the center of the bridge vsince the slidable bridge parts |6 and ^|'1 are projected by precisely equal amounts beyond the respective ends of the casing or are retracted precisely equal amounts within the casing on the rotation of the control member. The resulting bridge is consequently symmetrical at all times about the axis of the control member, regardless of the various Vadjusted positions thereof. l Y

In that form of the invention shown in Figs. "7 to 1l inclusive, and `which is the `now preferred '"form, the slidable bridgerparts 5.0, 6| are of .sub-

stantially rectangular outline and are arranged `in lateral-ly overlapping relation fas best s een in Fis. 8. The part |50 terminates in the loops l62 vadapted 4to .reoeivethe fpin rloonnecting it to the goggle frame yl2", whiie `theftrifige part `s`| `terminates uin the' loops |53l adapted to receive the` hinge pin pivoting it to the frame "|3. Each'fof Athe bridge parts is provided with a longitudinally extending `centrally arranged' slot, 5

ing disc 69 (Fig. '11), provided with the internally threaded'hub 10 projectingfrom the inner wall thereof, and with the diametrically opposite pins `11, 12 of different lengths projecting from the outer wall 13 thereof and in radial spaced relation to the hub. Y Y

"Ihe pin 1| is made of sufficient length to pass freely through and to `move freely in the preferably arcuate slot 14 4in the bridge part 6|, said slot 14 being arranged below the slot l65 and in position to properly receive the pin H and 'to permit movement of the pin in the slot as the operating disc 69 is rotated. f

The pin 1| after passing through the slot 14, enters the upright slot 15 of the bridge part 60, which slot isI arranged below the central slot 64 of said part. The pin'1 2, however, enters the slot 16 provided in the bridge part 6| above the slot 65 thereof. A

To maintain the disc in its proper position and to permit locking thereof in place and thereby to lock the bridge parts in their adjusted'position, the combined control and locking member 11 is provided. Said member is made in the form of a screw having ahead 18 and an externally threaded shank 19 passing loosely through an opening inthe front wall of the cas-A ing and screwed into the correspondingly threaded hub 10 of the operating disc.- In the head 18 is.v formed the recess 80 receiving the spring 8|, which, through the control member, urges the operating disc 69 toward the bridge parts 6B, 6|. A screw 82, having an enlarged head adapted toy be brought into engagement with the hub Handhaving a shank 83 entering kan internally threaded recess in the screw shank 19, rotates with said shank on the `rotation of the control member and limits the amount of unlocking rotation of the control member to prevent separation thereof from the disc.

Unlocking of the parts for adjustment of the bridge is attained by rotation of the control member 11 in the proper'direction, whereby thedisc 69 moves inwardly relatively to the control member and releases the pressure thereof upon the bridge parts 60, 6|.- After the pressure on the parts has been released and the Vparts have been thus unlocked, the bridge parts 68, 6| are pulled apart to increase the effective length of the bridge or pushed together to reduce said length to the desired overall amount. During this operation, the pin 1| is urged by the slot 15 in one direction,` while the pin 12 is urged by the slot 16 in the opposite direction, thereby rotating the now loose disc 69 together with the Y control Vmember 11, sufficient resistance tothe movement of the bridge parts 68, 6| being provided by the spring 8| which urges the member 11 outwardly and thereby exerts suicient pres` sure therethrough on the disc 89 to prevent the parts from becoming too greatly separated. After the bridge parts have been adjusted in the manner described while they are hel-d so ad- ,.iusted,` theV control member 11.ish rotated inthe proper direction to tighten the parts, theshank 19 moving through the hub 18 and thereby moving the hub toward the bridge part 6| to tighten `it against the bridge part 60 which is in turn pressed against the front wall of the casing, thereby to clamp or lock the mechanism in the adjusted position.

In the form of the invention shown in Figs. 12

and 13, the bridge parts 68 and 6| are substanV 10 tially identical with those described in connection with Figs.' 7 `to'11 an-d are'mounted for slid- .fing movement within the casing 85. Said cas- `-ing iscprovidedwith theV 'opening 86 iny its rear wallfto receive the disc 81.' The hub 88 of the l5 disc, however, 'is not threaded,but is pinnedlas `byimeans ofthe pin 89tothe shank 90 of the operating' member for `rotational movement 4'as a unit. therewith..` The head 9| of said member isv provided with wings 92, 93, .similar tothe 2o Wings `53, 54 `of Fig. 6, saidwingsbeingarranged to 4move axially of the' shank in the respective slts.94, 95 of the hollow control member 96. The shank v9|| passes loosely through an opening` in the front wall of the casing and also passes loosely through the base ofthe control .membenI Said control member isprovidedwith .the projection 91, similar to the projection 3| of Fig. 5, entering a selected one of thenlocking perforations or openings in the front wall of the casing. The spring 99` `urges the control member-96 inwardlyandxthereby urges the projection 91 into its lockingA position` in the selected opening. 98. The member 81 is provided with the pinsl, |0| of unequal lengthentering the s1ots16 15respecti velyof the `slide `members .-.andfoperating similarly to the pins 1|, 12 `oi `Fignll.l A 1 'i i ,To-adjustwthe bridge. the control member 96 ,is Inovedoutwardly `against `the action of the LOspring 99 to remove the projection 91 fromvits opening `'98,I thereby releasing the shank 90 for rotation.- Rotation ofthe control member in fits outward position rotates said `shank 90 through the wings 92, 93, thereby rotating'the disc 81 and rotating the pins |90, 10| in oppositedirec- 4tions to operate the slidable bridge parts.60, 6| in the required directions and thereby to lengthen or shorten the overalldlength of the bridge.` Release of the control member 96 permits the spring v 99 to urge the controlmember toward the casing 85 'and thereby to `reinsert the projection!" into the nearest opening 98, whereby the parts are locked in` the adjusted positions thereof. l

, -It1will be seen thatl have provided a simple and eflicient bridge adjusting mechanism adapted for commercial manufacture, which acts through a rotatable operating member tomove the-adjustable `bridge parts `in opposite directions, `the parts being protected, supported and guided in a casing duringadjustment and being readily locked in place after the adjustment `thereof toprev `ventaccidental disturbance of the adjustment."

,t A Any variation or modication of the invention described above which does not depart from `the spirit of the invention'is intended to be included within the scope of the appendedfclaims. l. o

I claim:

p l. Ingoggles, an adjustable bridge comprising -a pair of'overlapping bridge members,- each'of said members having `a non-circumferential slot therein, a disc rotatably 4mountedladjacent the overlapped parts of the members', the slot 'of `one member being on the opposite side of the axisvv of the disc from the slot in the vother member, a Airst pin on the disc passing looselythrough one ef tbe, members and .irte the elet, ei the .other member, and eeeeeei ein Q11 ihediseen the etherside ef tbe eri-is. tbe dise fremeeid, iiiSi ein ged Shorter tbe-.giet pin entering the slet ef andere, of the members, whereby leegi- 2 tgdisel ef the members in eppeeiie directions simultaneously rotates `the disc and 'rotetienbf the dise .Causes simultaneous longitudimevementof the members ,in Qpeesite direee tions.

12.. In gogglesa guide casing, a Pair, .of bridge members slidable 'longitudinally in the casing and lguided thereby,.each of the bridge members havk ing an inner edge in transverse spaced relation Yto the inner edge of the other bridge member, f

a longitudinally extending rack on the inner edge of each of the bridge members, a pinion having a 4hub :mounted in the casing, ,said pinion being arranged between and engaging said racks, a

rotatablev control member slidable on the hub:y

`and operatively connected thereto for rotation as a unit with the pinion, said control member being springfpressed toward the easing, and coop- .erating meanson the control member and on the casing operative in that position of the control i member in which the control member is nearest the casi-ng forlocking the control member in any pi-ngv slotted bridge members arranged in face to A-face relation, a rotatably mounted disc engaging the rear one of said members, a pair-'fof pins of unequal length carried by the disc, the shorter l1 yof vsaid pins entering a slot of therear `bridge member, said slot being arranged ynon-circumferentialiy of the disc and on one side of the axis lo i the disc, the longer pin passing vloosely through 'the rear bridge member and entering a similarv 'slot of the `front bridge member, said slot being arranged en the other side ofthe axis of the dise, andreleasable means for rloclring the disc against rotation.

44. A-n optical mounting according to claim 3 in which the locking means comprises a manually operable member having a head and a screw threaded shank srewed'into the disc, the head and the disc being on opposite sides of the bridge members and a spring interposed between the head and the bridge members to maintain the disc in pressed engagement with the rear bridge member when the manually operable member is unscrewed lfrom its locking position, in which position the manually operable member is screwed tightly 'into the disc with the bridge members clamped therebetween.

5. An optical mounting according to claim 3 in whih the loclging means comprises a shaft extending forwardly of the disc and through the bers, end-means for maintaining seid. members ,member- 7. .In goggles, a pair of relatively slidable bridge parts arranged inVv overlapping relation,.a tubular casing surrounding adjacent overlapping portions of said parts andhaving an opening in the front wallthereof and having a seriesvo'f circumferentially spaced locking perforations therein in radially and outwardly spaced Vrelation to the lirst .mentioned opening, arst rotatable member passirigtbreggh Seid mening? e manually ererebie eerltrel member eiieiebiymounted eifihe iront end-0f Seid iiretmember. preieetien en .Seid @0317?91 'member @Trmgiq t0 @liter a Selectd' one of said perforations thereby to loci; the control member against rotation, an operative connection between the controlmember and said rst member permitting relative sliding movement of said members andconnecting said members for rotation as aunit. when said projection is removed fromsaid perforation, a second rotatable member secu-red to the rear end of said rst member 'and having diemetrieally opposed projecting portions thereon arrangedwthin the casing and in operative engagement respectively `with the respectiveV bridge parts to slide said parts relati-vely to each `other and a spring surrounding bridge mem-bers, a control member slidable onv the'shaft and revoluble therewith and having VIAlongitudiifi-al slots therein, an enlarged head on the'jshaft having extensions `enteringthe slots of `the control member and forming an operative connection between the control member and the shaft and means for maintaining the control V-member against rotation in any one of a num- 'ber of different rotated positions thereof when `.the control member is moved into its rearmost position onu the shaft.

.-6. `In an optical mounting, a pair ofY relatively Aslidable overlapping bridge members, rotatable means vhaving `an operative connection with said members for nlongitudinally adjusting said'memthe first member and urging the control member and said rotatable members in opposite directions, the control `member being urged toward vthe casing thereby to Amaintain the projection in the selected perforation when the control member is released.

8. In goggles of the character described, a bridge comprising a pair Vof .substantially at overlapping slidable members, means for adjusting the effective length of the bridge, said means comprising a rotatable member arranged with its axis substantially perpendicular to the slidable members, an enlargement secured to the rear end vof the rotatable member and adapted to contact the rear face of the rear one of the slidable members, and cooperating interengaging meansV on the enlargement and slidable members to transmit movement of a selected member to the other imembery and means urging the front end of the "apair of overlapping bridge members, a rotatable member arranged with its axis substantially perpendicular to thebridge members andY engaging one of saidbridge members, one 'of said bridge members having a non-circumferential slot therein on one side of the axis'of the rotatable member, and the other bridge member having a simi- :lar slot therein on the other side of said axis, a -first pin `on thei vrotatable member arranged on one side of the axis thereof and entering the slot of and in operative engagement with said one only of Athe bridge members, and a second ypin on the 'rotatable member passing through said 'fone of the bridge members andf-into theslot of the other bridge member and arranged o n the `other side o ftheaxis of the rotatable member and in operative engagement with the other only ofthe bridgemembers. o j

10. In goggles, a' bridgeV comprising `a pair `of relativelyslidable members, 'each having' substantially `ilat front andrearv faces, at least one of thefaces of one member*beingsubstantially coplanar with afiac'e of the` other member, adjust-` ing means operativelyconnected to the members to slide the members simultaneously in opposite directions and thereby to adjust the combined effective length of said members, said means including a rotatable element, and means for normally locking said adjusting means and the members in the adjusted positions thereof, said locking means comprising a rotatable control member rotatable about and movable longitudinally along an axis substantially perpendcular to the general plane of said slidable members into and out of pressed engagement with the casing hereinafter mentioned, a casing passing around said members and supporting the adjusting means, and means for normally maintaining the control member in pressed engagement with the front part of the casing normally to prevent rotation of the control member and of the aforesaid rotatable element, said control member operatively engaging said rotatable element to rotate therewith on the release of the -pressed engagement between the control member and the casing and to prevent rotation of the element when rotation of the control member is prevented.

11. In goggles, a pair of bridge members each having non-circumferential slots therein and arranged in face to face slidable relation, a casing slidably supporting the members, a rotatable operating member passing through an opening in the casing and through the bridge members, a disc secured to the rear end of the rotatable member behind the rear bridge member and` engaging the rear face of said rear member, diametrically opposed pins on the disc fitted into the respective slots of the bridge members, and a spring at the front end part of the rotatable member urging said end in an axial direction away from the casing and thereby pressing the disc against the rear bridge member.

12. In goggles, a pair of bridge members, rotatable means for moving said members in opposite directions including a revoluble element operatively connected to the bridge members and having a pair of opposed substantially radial extensions, a control member having a pair of opposed slots receiving said extensions respectively, said control member `being slidable on the revoluble element to an unlocked position and being revoluble with said revoluble element, said slots being parallel to the axis of the control member and of sumcient length to permit movement of the control member from a locked to an unlocked position, and means for locking the control member against rotation in a selected position and thereby locking the element against rotation, said locking means including a spring urging the control member toward the locked position thereof. l

Y 13. In goggles, a casing, a pair of bridge members slidable in the casing, means for sliding said members in opposite directions including a revoluble element engaging said members, a support member projecting from the revoluble elerotatablev therewith asa unit, said control member havinga pair Yof opposedslots receiving and cooperating with the extensions l of the support member, said -slots being parallel'to the axis of the control member andof sufficient length to permit sliding movement of thecontrol memberv on the support member -froma locked to an unlocked position\,`th`e extensions sliding in the slots to form ang operative connection-o between `said support and y' control Vmembers-` andl means,` including a spring urging the `control member toward the locked position'thereof; cooperating `with the casing for'locking the control member against rotation when said control member is moved on the support member to its locked position and thereby locking the support member and the revoluble element as a unit relatively to the casing in any selected one of a number of different positions.

14. In goggles, an adjustable bridge comprising a pair of overlapping bridge members each having a longitudinally arranged middle slot therein, one of said members having a longitudinally arranged curved slot below the middle slot and having a transversely arranged slot above the middle slot, the other of said members having a transversely arranged slot below the middle slot, a tubular casing around the members and open a't both ends, said members ,projecting through the respective open ends of the casing, a disc rotatably mounted in the casing, a `pair of pins carried by the disc and arranged respectively on opposite sides of the center of thedisc and of unequal length, the longer of said pins passing through the curved slot of said one of the bridge members and into the transverse slot of the other bridge member, the shorter pin entering the transverse slot of said one of the bridge members, and a manually operable member having a head outside of the casing and having a shank passing through a wall of the casing and through the middle slots of the bridge members and secured to the disc.

15. In goggles having a pair of eye frames, a bridge adjustably connecting the frames and comprising a toothed member connected to one of the frames, a similar toothed member connected to the other frame, a pinion engaging the teeth of both toothed members, means normally locking the pinion against rotation including a manually rotatable spring-pressed control member mounted for axial sliding movement relatively to the pinion, a casing around the toothed members, said control member being urged toward the casing, and locking elements on the control member and on the casing, said elements interengaging to lock the control member to the casing when the control member is moved toward the casing, said locking elements being disengaged from each other when the control member is moved away from the casing, and means operatively connecting the control member to the pinion to rotate the pinion on the disengagement of the locking elements and therotation of the control member and thereby to move the bridge members toward and from each other.

16. In goggles having a pair of eye frames, a

` casing having a plurality of circumferentially ment to rotate the same and provided with a pair of opposed transverse extensions, a control member slidable axially on the support member and spaced openings therein, a first bridge member slidable in the casing and secured to one frame, a rst rack on the member, a second similar bridge member slidable in the casing, a second rack on the second bridge member parallel to and in transverse spaced relation to the first rack, a pinion engaging said racks, and a manually operu h hxlotatable mem- 111g,r rlsablq fqnnrotatignfrwtb*the pinion. as a ber against Said One-bridge member"- unit me. controhmembems moysd axially 10 Y mmh@- V oppas.11155;slims L;;s).,r1.-- aLsumQen-Qitgce t0 Withdraw the projection fromthe opening. 

